Telephone handset filter



FIG. 1 is a perspective view of a telephone handset filter showing my new design, the fragmentary broken line showing of a telephone handset being for illustrative purposes only;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a front view thereof, the rear view being the same; and,

FIG. 5 is a right side view thereof, the left side being the same. 

The ornamental design for a telephone handset filter, as shown and described. 